541997909 has 2 divisors, whose sum is σ = 541997910. Its totient is φ = 541997908.

The previous prime is 541997903. The next prime is 541997947. The reversal of 541997909 is 909799145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 436935409 + 105062500 = 20903^2 + 10250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-541997909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (541997903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 270998954 + 270998955.

It is an arithmetic number, because the mean of its divisors is an integer number (270998955).

Almost surely, 2^541997909 is an apocalyptic number.

It is an amenable number.

541997909 is a deficient number, since it is larger than the sum of its proper divisors (1).

541997909 is an equidigital number, since it uses as much as digits as its factorization.

541997909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 918540, while the sum is 53.

The square root of 541997909 is about 23280.8485455320. The cubic root of 541997909 is about 815.3283377268.

The spelling of 541997909 in words is "five hundred forty-one million, nine hundred ninety-seven thousand, nine hundred nine".